Spark-plug.



J. KA.

SP LUG.

| TION [TILED IAN. 6,1914.

Patented May 11, 1915.

from e on the insulating JOSEPH TRISKA, OF QMAHA, NEBRASKA.

SPARK-PLUG.

inseam.

' Specification of Letters Patent.

Patented May ii, ieis.

Application fired January 6, 1914. Serial no. 810,582.

To all whom it may concern;

Be it known that I, JOSEPH :TRISKA, a citizen-of the United States, residing at Omaha,

in the county of Douglas and State of Nebraska, have invented certain new and useful Improvements in Spark-Plugs, of which the following is a specification.

This invention relates to improvements in spark plugs, and has for its object to provide means for preventing the formation of a short circuit between the electrically energized conductor and the metallic'housing or ground electrode of the spark plug;

i In the use of spark plugs, as is well known, carbon will be deposited in the chamber of the spark plug, this being occasioned b the burning of the gas. From continue use of the spark plug a deposlt of the carbon will usually be formed between the insulating plug and the metallic housing, with the result that the deposit will operate as a. conductor or short circuit "for the electric charges. The frequent removals of s ark plugs 'ne cylinders required or the pur ose of removing the carbondepo'sits thererom, is'a matter of inconvenience and ex- .pense. By use of the herein described construction, the carbon deposits will not form lug, and it has been found to be useful or preventing the forrnation of carbon deposits within the air chamber.

The invention consists of the novel construction, combination and arrangement of parts as described herein and claimed,.and as illustrated in the drawing, wherein,-

Figure 1 is a view in longitudinal section of a spark plug, and parts supporting the same, to clearly show relative position of parts. Fig. 2 is an end view of a scourin member, r1der or sleeve for the stem of the insulating plug, said stem being in transverse section. Fig. 3 is a side or plan view of the sleeve. Fi 4 is a view, partly broken and in section, 0 the spark plug.

Referring now to the drawing for a more particular description, numeral 1 indicates a suitable support, as the wall of an engine cylinder, within which charges of gas may be delivered, to be i nited or exploded by means of the spark p ug, and it will be understood' that an ignition of gas occurs by reason of the spark, said spark being occasioned by an electric charge passing from the finger a of the conductor 2 through the air-gap to the metallic finger 3, mounted upon the housing 4, said housing and the metallic parts connected therewith operat-- ing as the ground electrode.

Carbon will be deposited on the stem b of the insulating plug 5 within chamber 6 of the housing 4: from ordinary use of the spark plug, and normally will adhere thereto; and when, ..from continued use ofthe spark plug, the deposits have increased sufiicientlyto make contact with the metallic wall of member 4, the carbon willgenerally J operate as a conductor between this member and the finger a, so that the charges of gas will not be ignited. a

I provide any suitable rider, scouringmember or sleeve 7, prefrably formed with an annular ridge 0 between its ends, and mount it on the stem b, of theinsul'ating plug'o. At 8. is indicated a washer having a diameter ,of sufficient extent to prevent removal of "the sleeve from said stem, the washer heir. of the con uctcr 2 and the terminal of stem 6.

In operation, the rider or sleeve will have sliding movements on the stem, 6 by and on disposed between'the boss 0? accountvof the vibrations caused by the explosions of ignited gas within the engine, or-

on account of suction. its sliding movements will be automatic, and will prevent the accumulation of carbon on said stem and will prevent the formation of deposits of carbon within the chamber of sufficient eX-' tent to cause the objectionable short circuit mentioned;

At 9 is indicated a s ring adapted to engage the sleeve 'ri er, movements in one direction. On account of suction and the explosions referred to, the

sleeve will be reciproeated longitudinally on or resisting its.

ting upon the body portion of the insulating plug for engagement with said sleeve.

In testimony whereof I have afiixed my signature in presence of two witnesses.

JOSEPH TRISKA.

chamber, an insulating plug having a body portion mounted in said housing and. having a stem disposed centrally of the chamber for circumscribing a conductor, a detent member mounted on the terminal of the stem a sleeve formed with an annular ridge and ioosely mounted on said stem adjacent to said detent member, and a spring abut- Witnesses:

HIRAM A. Smells; KENNETH S. FmnAYsoN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner ,of Patents.

Washington, I). C. 

